Grinding machine



I. M. STREHL.

GRINDING MACHINE.

APPLICATION FILED MAR. 26, 192].

1,437,620. Patentd Dec. 5,1922.

Patented Dec 5, 1922.

EAST 7,62%

safe e l GRINDING; ivraoi-nnn.

Application filed March 26, 1921. Serial no. 455,791.

To all whom it may concern:

Be it known that 1, JOHN M. S'rnnHL, a citizen of the United States, residing at'S'eattle, in the county of King and State oi Washington, have invented certain new andusetul Improvements in Grinding Machines, oi: which the following is a specification.

My invention relates to improvements 111 machines for grinding scissors, and other small instruments, and its objects are: first, to provlde a means whereby the relative po- 'sition of the scissors carrying clamp with the grinding wheel may be varied while in the process of grinding; second, to provide a mean's'wherehy the scissors carrying clamp will return, automatically, into its normal position and, third, to provide a means whereby the scissors ca rying clamp or head cannot be revolubly adiusted beyond a cerhead. Fig. 3 is a back viewof a short lengthof the standard that supports the clamping head. Fig. 4 is a 't'ro'nt'view of the same with the upper end partly shown in section to disclose the connecting elements between the two ends of the standard. Fig. 5 is a perspective of the dividing plate that is inserted between the ends of the upper and the lower part of the standard, and Fig. 6 is a perspective of the end of a scissors blade such as this implement is especially designed to grind.

Similar reference characters indicate simi lar parts throughout the several views.

In the accompanying drawing; 1 represents the bed 01 a grinding machine. 2 is the grinding wheel. 3 is a guideway "for carrying, and for the longitudinal adjustment of the adjustable tool carrying head. This uideway has an integral arm 3 that is ma e to slide in the groove is in the bed 1, and is securely clamped in place, when properly adjusted, by means of a set screw 1. The grinding wheel 2 is made to revolve by means o1 the crank 15 through the 111- dium of the gear train 19 and the shaft 1.4.

My tool carrying head consists of two parts, 8 and 9, the part 8 having the permanent head 6, and the adjustable head 6,

the latter being secured to the upper end of the part 4 by meansof a scr 17 that passes through slot 7; so the head or clamp 6 maybe raised and lowered to provide for the varying thicknesses of tools to be ground on the machine, and may be clamped solidly upon the tool by means of the adjusting screw 'Z. The part 9 is provided with a right angular bearing arm 5 that is adjusted to slide freely in the guideway 3, and with adjustment for sidewise swing, as indicated in Fig. 1. I

In the development of my invention the tool carrying'standard 8'9 is divided upon the line oi": Fig. 2, and a hole, 18., is drilled intoone section of the standard for the reception oi the dowel 13, so adjusted that the endS oi the standard may be made to oscillate to certain degree, as indicated by the solid, and the dotted outlines of the clamping head 6 in 1, to bring diiierent angles or curves of a tool into contact with the wheel 2when grinding, especially whengrinding a curved scissors blade, indi-' ca'ted in Fig. 6. I

The two ends oi the standard 89 are held in place by means of a set screw 12 that passes throng-lithe side of the standard and into the slot in the dowel 13, loosely enough to allow the part8 to be revolved slightly and tightly enough to prevent the part 8 from being removed longitudinally from its bearing upon the dowel. This set screw acts double purpose, first, the purpose hereinbefore' stated, and, second, it acts as a bearing for the spring 11, which latte is firmly anchored to the part 9 at (Z, passes by, and bears upon the set screw 12 and thence passes upwardly and outwardly, and is again anchored to the clamp head 6, as at a, so its tension will hold the head 6 always in normal position parallel with the grinding sur- "face of the wheel 2, yet suiliciently flexible so the head may be easily revolved by the operator.

Up to this point the operation of the head 6 will beperttectiy satisfactory as the action of the screw 19 inthe slot will prevent the head 6 from being swung around too far, but to make assurance doubly sure I have provided for placinga dividing plate 10 between the two ends, said plate having a downwardly extending wing at, and an upwardly extending wing Z) at the back side of the standard, and two downwardly extending wings, a, at the front side of the standard so arranged that the wing b will engage the upper end of the standard at a given pointof its revoluble movement, and will prevent it from revolving any farther than as adjusted for.

The arm 2' is made integral with the clamp head 6' and the screw 17 that passes through the slot it, as hereinbefore stated, is screwed into this arm, 2', and may be adjusted to produce any degree of friction necessary for the proper adjustment and handling of the clamp, for the purpose of properly securing the tool, 16, to be clamped between the jaws 6 and 6 to be therein held for the purpose of grinding the tool.

It is to be understood that the guideway 8 may be moved away from, or toward the base 1 of the grinder by loosening the set screw 4 and adjusting the arm 3' as desired, and that the lateral adjustment of the head 6 is brought about by sliding the bearing 5 longitudinally in the guideway 3. The

head 6 may be swung toward, or away from the wheel 2 by swinging, or drawing it away from the wheel until the lower end of the standard 9 comes in contact with the lower edge of the guideway 3, and the revoluble movement is adjusted by the operator by swinging its left hand end around as indicated by its dotted lines in Fig. 1. The hole 9 through the plate 10 is for the passage of the dowel 18, which must be made integral with the end of the standard that carries it.

t is immaterial whether this dowel is secured to the lower end of the standard, as

curved end, which cannot be successfully done with an arbitrarily mounted tool holder.

Having thus fully described my invention, what I claim as new, in the art, is:

1. In combination with the bed, driving mechanism, and adjustable guideway of a grinding machine; a standard slidably mounted in the guideway and divided later ally for revoluble adjustment of the upper end thereof, adjustable clamping jaws connected with the upper end of the standard, a dowel secured to one end of the standard and passed in to the end of the adjacent end of. the other end of the standard and having a lateral slot therein, and a set screw made to engage said slot to properly adjust the revoluble end of the standard, and clamping heads mounted upon said revoluble end of the standard. I

2. in combination with the bed, driving mechanism, and adjustable guideway of a grinding machine; a standard slidably mounted in the guideway and laterally divided, a dowel made integral with one end of the standard and passed loosely into the adjacent end of the other part of the standard, and having a lateral slot in one side, a set screw passed through the standard and into said slot, a spring so connected with the two parts of the standard as to hold the same in normal position, and means whereby the free end of the standard may be revolved a given distance.

3. in combination with the elements covered in claim 2, an adjusting plate placed between the severed ends of the standard and having wings properly placed to regulate the revoluble movements of the upper end of the standard.

Signed at Seattle, Washington, March 12,

JOHN M. STREHL. 

